Need your help and expertise diagnosing my fridge. I'm at a loss!

Hi, I have a Kirkland Signature ST14CKXHW00 (top/bottom). This is my drink fridge and usually drinks are around 34 degrees. Lately I noticed my drinks have been around 65 degrees while the freezer remains about 0-10 degrees. I researched online and I tried the following: 1. Removed all contents, disconnected power and opened doors for 24 hours to thaw any possible ice chuck blockages. Result: No change. 2. Removed back panel to view the evaporator coil (however, it was not caked in ice). Used a flat-head screwdriver and manually turned the defrost timer on. Result: Defroster is working, coil temperature reached 50 degrees within a minute or two and melted any frost appearing on the coils. 3. Waited 30 min to see if defrost mode automatically returns to cooling mode. Result: After approx 30 min of defrosting, timer automatically triggered the fan back on, therefore I assume the defrost timer is NOT faulty.